diff options
Diffstat (limited to 'lib/libelf/libelf_memory.c')
-rw-r--r-- | lib/libelf/libelf_memory.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/lib/libelf/libelf_memory.c b/lib/libelf/libelf_memory.c new file mode 100644 index 00000000000..550211b689f --- /dev/null +++ b/lib/libelf/libelf_memory.c @@ -0,0 +1,96 @@ +/*- + * Copyright (c) 2011 Joseph Koshy + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <ar.h> +#include <assert.h> +#include <string.h> +#include <libelf.h> + +#include "_libelf.h" + +ELFTC_VCSID("$Id: libelf_memory.c,v 1.1 2019/02/01 05:27:38 jsg Exp $"); + +/* + * Create an ELF descriptor for a memory image, optionally reporting + * parse errors. + */ + +Elf * +_libelf_memory(unsigned char *image, size_t sz, int reporterror) +{ + Elf *e; + int e_class; + enum Elf_Error error; + unsigned int e_byteorder, e_version; + + assert(image != NULL); + assert(sz > 0); + + if ((e = _libelf_allocate_elf()) == NULL) + return (NULL); + + e->e_cmd = ELF_C_READ; + e->e_rawfile = image; + e->e_rawsize = sz; + +#undef LIBELF_IS_ELF +#define LIBELF_IS_ELF(P) ((P)[EI_MAG0] == ELFMAG0 && \ + (P)[EI_MAG1] == ELFMAG1 && (P)[EI_MAG2] == ELFMAG2 && \ + (P)[EI_MAG3] == ELFMAG3) + + if (sz > EI_NIDENT && LIBELF_IS_ELF(image)) { + e_byteorder = image[EI_DATA]; + e_class = image[EI_CLASS]; + e_version = image[EI_VERSION]; + + error = ELF_E_NONE; + + if (e_version > EV_CURRENT) + error = ELF_E_VERSION; + else if ((e_byteorder != ELFDATA2LSB && e_byteorder != + ELFDATA2MSB) || (e_class != ELFCLASS32 && e_class != + ELFCLASS64)) + error = ELF_E_HEADER; + + if (error != ELF_E_NONE) { + if (reporterror) { + LIBELF_PRIVATE(error) = LIBELF_ERROR(error, 0); + (void) _libelf_release_elf(e); + return (NULL); + } + } else { + _libelf_init_elf(e, ELF_K_ELF); + + e->e_byteorder = e_byteorder; + e->e_class = e_class; + e->e_version = e_version; + } + } else if (sz >= SARMAG && + strncmp((const char *) image, ARMAG, (size_t) SARMAG) == 0) + return (_libelf_ar_open(e, reporterror)); + + return (e); +} |